How to build the BGP UPDATE packet


bgp-update-create is a small program used to generate the payload of a BGP UPDATE message. It was written to test if routes could be injected in a BGP conversation between two routers.

It’s usage is very simple; it takes three parameters:

—as: Autonomous System number

—nexthop: Host name or IP address of next hop

—destnet: Network number/prefix to advertise

To use it with tcphijack you just pipe its output to tcphijack, like in:

sudo bgp-update-create —as 2 —nexthop 1.1.1.1 —destnet 2.2.2.2 | tcphijack […]

or just send its output to a file and then use tcphijack’s -P switch to specify a payload:

bgp-update-create —as 2 —nexthop 1.1.1.1 —destnet 2.2.2.2 > payload.dat


sudo tcphijack […] -P payload.dat


bgp-update-create
is built at the same time as tcphijack (by typing «make»), the header files used by bgp-update-create.c come from the Zebra project.



BGP Update Create download
 

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